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from webkitpy.common.watchlist.watchlistparser import WatchListParser


class WatchListLoader(object):
    def __init__(self, filesystem):
        self._filesystem = filesystem

    def load(self):
        config_path = self._filesystem.dirname(self._filesystem.path_to_module('webkitpy.common.config'))
        watch_list_full_path = self._filesystem.join(config_path, 'watchlist')
        if not self._filesystem.exists(watch_list_full_path):
            raise Exception('Watch list file (%s) not found.' % watch_list_full_path)

        watch_list_contents = self._filesystem.read_text_file(watch_list_full_path)
        return WatchListParser().parse(watch_list_contents)